1,720,966 research outputs found
Évaluation d'un outil robotique pour le désherbage et le suivi des cultures bio-intensives
No full textWeeding is a key issue in organic agriculture, especially in the organic market gardening agriculture. Farmers are not allowed to use chemical solutions to take out the weeds, they can only use mechanical and thermic solutions in their exploitations. Farmers say that the weeding process is one the most time-consuming task in the maintenance job. Weeding causes physical pain to the farmers, is labor intensive and is considered a very tedious task. A solution to this problem would be to set robots in farms to do the weeding part. Robots could weed by using technics respectful of the rules of the organic agriculture. Peter Hanappe and David COIliaux, researchers at the Sony CSL laboratory are creating a robot, called LettuceThink, that can weed beds of market gardening cultures. This robot can determine the location of the vegetable and weed around the plant thanks to an animated arm. In this dissertation are presented the results of experiments created to put to test the efficiency of the robot. Efficiency is here defined as the ability of the robot to weed in the real conditions of use. Those conditions include the diversity of weeds existing in a market gardening farm, the diversity of cultivated plants and of weather conditions. In the second part of this dissertation, I present the results of discussion that I had with market gardening farmers. The two major subjects of the discussions were their technics of weed management and the possible interest of the robot LettuceThink in their farm. The aim of these talks was to understand the need of professional market gardeners in terms of robotization and to figure out hoW the robot will be able to meet this need. The experiments and the discussions enabled us to find important ideas to improve the robot in terms of mechanics and algorithmic.Le désherbage est un problème important de l'agriculture biologique, surtout dans le maraîchage biologique. Les agriculteurs n'utilisent pas de produits phytosanitaires pour désherber et doivent gérer la présence des adventices uniquement avec des techniques mécaniques, thermiques et manuelles. Cette activité est la plus chronophage de toutes les activités d'entretien. Elle est considérée comme fastidieuse, cause de problèmes de santé aux maraichers et est très couteuse en main-d'oeuvre. Une des solutions à ce problème est d'installer des robots désherbeurs au sein des parcelles qui utilisent des techniques respectueuses des contraintes de l'agriculture biologique. Peter Hanappe et David Colliaux, chercheurs au laboratoire Sony CSL travaillent sur un robot désherbeur, appelé LettuceThink, capable de désherber des planches de cultures maraîchères. Ce robot est capable de détecter la position des cultures et désherbe autour de manière mécanique grâce à un bras animé. Dans ce mémoire sont présentés dans un premier temps des résultats d'expériences testant l'efficacité du robot. L'efficacité a été définie ici comme la capacité du robot à désherber dans les conditions réelles d'utilisation avec une grande diversité, d'adventices, de plantes cultivées et de conditions environnementales. La deuxième partie du mémoire se concentre sur les résultats de discussions menées avec des maraichers portant sur leurs techniques de désherbage et la potentielle utilité du robot dans leurs exploitations. Le but des discussions était de connaitre les besoins des maraichers dans le domaine de la robotique et de comprendre comment le robot peut y répondre. Les conclusions tirées de ces expériences et discussions ont permis de mettre en place des pistes d'améliorations pour le robot d'un point de vue mécanique et algorithmique
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Ausstellung "concrete & samples" im Siegener Museum für Gegenwartskunst (bis 20.09.2009)
No full textArmin Linke (mit Peter Hanappe): Phenotypes / Limited Forms, Installationsansicht, Sao Paulo Biennale, 2008 " .... Armin Linke präsentiert das fotografische Archiv als solches, es ist nicht länger lediglich ein Werkzeug des Fotografen, das unsichtbar im Hintergrund bleibt. Die mit dem Archivarischen verbundenen Tätigkeiten der Selektion, der Kategorisierung sind immer wesentliches Thema der fotografischen Arbeit des Künstlers. Dabei wechselt die künstlerische Strategie zwischen Systematik und..
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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